* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.app1 {
  width: 100%;
  height: 100vh;
  display: flex;

  .left {
    width: 100px;
    // background-color: skyblue;
    height: 100%;
    overflow-y: scroll;
    display: flex;
    flex-direction: column;
    padding: 0 4px;
    box-sizing: border-box;

    a, span {
      width: 100%;
      text-align: center;
      border-left: 2px solid #fff;
      margin: 4px 0;
      color: #000;
      &.active {
        color: red;
        border-left: 2px solid red;
      }
    }
  }

  .right {
    flex: 1;
    height: 100%;
    overflow-y: scroll;

    .list {
      display: flex;
      flex-wrap: wrap;

      .list-item {
        width: 33%;

        display: flex;
        flex-direction: column;
        align-items: center;

        img {
          width: 80px;
          height: 80px;
        }
      }
    }
  }
}


.qwer {

  .list {
    display: flex;
    flex-wrap: wrap;
    height: 100vh;
    overflow-y: scroll;

    .list-item {
      width: 33%;

      display: flex;
      flex-direction: column;
      align-items: center;

      img {
        width: 80px;
        height: 80px;
      }
    }
  }
}